Watch strap



FIG. 1 is a perspective view of a watch strap showing my new design in solid lines with the broken line showing of environmental association matter being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a watch strap, as shown and described. 